Micro, can't imagine that the engine isn't completely shot. Even a hundred feet with 3.5 quarts low is more than enough to destroy the mains and rods.
A PCV valve should NOT fail after 25k miles on a brand new engine - but when they DO fail, your entire crankcase can get drained in just a few miles. You must have been blowing a heavy cloud of black smoke (burning that oil) for quite a while. Yes, the convertor could very well (probable) have also been 'carboned' up, and it won't be cleanable.
PCV valve should have been good for a min of 50k miles - sounds like something else went bad that caused it to go out so catastrophically. Either way, it's a manufacturing fault, and fully the responsibility of the dealer to rectify under that 100k warranty.
Just my two cents worth.
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